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Linear Technology DC1362A-A Demo Manual

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DESCRIPTION
Demonstration circuit 1362A-A/1362A-B is a 4A high voltage
Li-Ion battery charger featuring the
LT3651EUHE-4.1. The LT3651 is a complete, high power
Li-Ion battery charger that can operate over a wide input
voltage range. The charger is a constant-current, constant-
voltage type with a maximum charge current of 4A that can
be externally set. A precondition feature trickle charges a
low voltage battery and bad battery detection provides a
PERFORMANCE SUMMARY
Input Voltage Range
VOUT
Output Float Voltage (Constant Voltage Mode)
Output Current Limit ILIM
OPERATING PRINCIPLE
LT3651 is a complete Li-Ion battery charger, addressing
wide input voltage (6.5V to 32V) and high charge current
(up to 4A). High charging efficiency, as shown in Figure 1,
is produced with a constant frequency, average current
mode synchronous step-down switcher architecture.
The charger includes the necessary circuitry to allow for
programming and control of constant-current, constant-
voltage (CC/CV) charging with both current only and
timer termination. High charging efficiency is achieved
by using a bootstrapped supply for low switch drop on
the high side driver and a MOSFET for the low side (syn-
chronous) switch.
Arrow.com.
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DEMO MANUAL DC1362A-A/-B
signal if the battery doesn't respond to preconditioning. The
LT
3651EUHE-4.2/
LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN
®
surface mount package with two exposed thermal pads.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T
6.5V to 32V
2.9V to 4.24V (–A)/2.7V to 4.14V (–B)
4.2V (–A)/4.1V (–B)
4A
Maximum charge current is set with an external sense
resistor in series with the inductor and is adjusted through
the RNG/SS pin. The total system input current is moni-
tored with an input sense resistor and is used to maintain
constant input current by regulating battery charge current.
It is adjusted through the I
If the battery voltage is low, charge current automatically
reduces to 15% of the programmed current to provide
safe battery preconditioning. Once the battery voltage
climbs above the battery precondition threshold, the IC
automatically increases the maximum charging current
to the full programmed value.
LT3651EUHE-4.2/-4.1
4A High Voltage Li-Ion
Battery Charger
= 25°C
A
pin.
LIM
dc1362aabfa
1

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Summary of Contents for Linear Technology DC1362A-A

  • Page 1 4A that can be externally set. A precondition feature trickle charges a L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Operating Principle

    DEMO MANUAL DC1362A-A/-B OPERATING PRINCIPLE Charge termination can occur when charge current de- battery temperature moves outside the safe charging range creases to one-tenth of the programmed maximum charge of 0°C to 40°C the charging cycle suspends and signals current (C/10 termination). Alternately, termination can a fault condition.
  • Page 3 DEMO MANUAL DC1362A-A/-B QUICK START PROCEDURE 4. Increase PS2 until VBAT is 3.6V. Verify the input cur- 8. Set JP1 to SHDN. Verify the charging current IBAT is rent IIN is between 1.4A and 1.7A, the battery current less than 5mA and that the FAULT LED, CHRG LED and IBAT is between 3.75A and 4.45A and that the CHRG...

  • Page 4: Parts List

    DEMO MANUAL DC1362A-A/-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP, X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L C3, C6, C11, C12 CAP, X7S, 10µF, 50V, 20%, 1210 TDK, C3225X7S1H106M CAP, X7R, 10µF, 10V, 10%, 0805...

  • Page 5: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.

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